Hard

กระด้าง

grà-dâang

(of water, high in dissolved calcium compounds)

ยาก

yâak

(requiring a lot of effort to do or understand)

ยาก

yâak

(demanding a lot of effort to endure)

ลำบาก

lam-bàak

(demanding a lot of effort to endure)

แข็ง

kɛ̌ng

(resistant to pressure)

แรง

rɛɛng

(of drink: strong)